_________ a certain doubt among the people as to the practical value of the project．
| A．It has | B．It remains | C．They have | D．There remains |
________ the Internet is bridging the distance between people, it may also be
breaking some families or will cause other family problems.
| A．When | B．If | C．While | D．Since |
________ your blog, I would have written back two days ago.
| A．If I read | B．Should I read |
| C．Had I read | D．If I could have read |
________ in his book, he didn't notice me ________ I entered the room.
| A．Devoted; when | B．Absorbed; while |
| C．Absorbed; when | D．Devoted; while |
How can you expect him to make any progress ________ you never give him a chance to have a try?
| A．when | B．unless |
| C．even though | D．until |
I'm sorry you've been waiting so long，but it'll still be some time ________ Brian
gets back.
| A．before | B．since | C．till | D．after |